Locking device for tool retainers



Patented June 23, 1931 {stares aren't orrics Dani-EL J. narronn, orCLEVEL ND; OHIO, ASSIGNOR TO THE otnvnnsnn noon nnint ooni-PANY, orCLEVELAND? 0310, a oonrona'rioii or onto LOCKING DEVICE FDR TOOLRETAINERS Application filed June 21,

This invention relates totool retainers for drills and similarinachines,and more specifica-llyto an improved locking mechanism therefor.

One of the objects of this inventionis to provide a tool retainer whichmay be readily opened or closed and which will assure the afiixationofthe cutting tool within its chuck when the machine is operated in ahorizontal plane. I

Another object of this invention is to provide a locking device for atool retainer which can be readily attached to a drill after the machinehas been placed in service.

Another object of this invention is to construct a tool retainer lockingmechanism which may be readily manipulated and which is sturdy of designand economic of manufacture.

Other objects more or less ancillary to the foregoing and the manner inwhich all the various objects are realized will appear in the followingdescription which considered in connection with the accompanyingdrawings sets forth the preferred embodiment of the invention.

In the drawings Fig. 1 is an elevational view of a fragmentary portionof a fluid operated machine illustrating the tool retainer and thelocking mechanism therefor in its operative position;

Fig. 2 is an end elevational view. of the head shown in Fig. 1 furtherillustrating the tool retainer;

Fig. 3 is an elevational view similar to Fig.1 illustrating the toolretainer and the locking mechanism therefor in its released po-si tionFig. l is an end elevational view of the drill head shown in Fig. 3illustrating the form of a tool retainer when it is adjusted to permitthe withdrawal of the tool from the machine.

Referring to the drawings the portion of the fluid actuated machineshown herein embodies a head 10 having oppositely disposed ears 11formed thereon, in which there are loosely mounted side rods 12, theupper portion of these rods being secured in the cylin- 1929. Serial No.372,692.

dcr of the machine. Upon one of the rods 12 there is a hook 13 which isadapied to supporta tool retaining member The tool. retainer comprises aunitary link angulated in its lineal plane, the end portions thereofforming the sections 15 and 1G. The link is formed with an enlargedcentral portion leaping an annular opening 17 therein which isinterconnected with elongated openings 18 and 19 defined by the walls ofthe end sections 15 and 16 respectively. The section 16 of the link isformed ata suitable angle with the major portion of the link and withthe supporting hook 13 to lie in a plane perpendicular to the cuttingtool 20 when the retainer is adjusted in its operative position. Asillustrated in Fig. 1 the opening 19 is proportioned with respect to thecircumference of the shank of the cutting tool 20 to snugly engage theouter portion of its perimeter when the retainer is adjusted to retainthe tool'wi thin its chuck.

The too-l 20 is constructed with a collar 21,-the diameter-of which iscorrelated with the centrally disposed opening 17 in the link to permitthe entrance or withdrawal of the toolwhen the section 15 of the link isad justed at an obtuse angle with the medial axis of the tool asillustrated in Fig. 3.

The opposite rod 12 is provided with a nut 22 which is formed with aboss 23 depending therefrom the outer portion of which is bifurcated tosupport a latch or stop 24. Intermediate the furcations of the bossthere is a spring-pressed plunger 25 which is disposed above the latchpivot pin 26 and adapted to bear upon the body of; the latch. Thefreeend of the latch 24 is upturned to abut the endportion of the head10 thus delimiting the vertical movement of the retainerwhen the latchis horizontally adjustec;

The effort exerted by the spring is suitable to maintain the latch inthe horizontally dis posed. position illustrated in Fig. 1 during theoperation of the tool notwithstanding the angulated-position thereof orthe vibration impartedthereto.

In operation the retaining member is normally maintained in the loweredposition as illustrated in Fig. 1 wherein the opening 17 1 to abut thehead 10 wherein'central opening 17 will be aligned'with the aXisof thetool thus permitting the collar to be withdrawn through the enlargedcentral portion of the link.

Although one particular embodiment of the invention has been describedin detail in the foregoing, it is to be understood that such embodimenthas been adopted'for the purpose of. illustration only. Moreover, it isto be understood that the specific terminology employed herein and theaggroupment of parts, as illustrated, are not intended to be restrictiveor confining since many changes in the design will doubtless occur tothose skilled in the art without departure from the scope of theappended claims.

I claim: 1. In combination with a tool retainer for a reciprocativelyoperated tool, a machine head, a tool retainer adjustably supportedthereby, and movable stop means interposed between said retainer andmachine head.

. 2. In combination with a tool retainer tor a reciprocatively operatedtool, a machlne head, a'toolretainer adjustably supported thereby and alatch adapted to be interposed between the said retainer and machinehead- 3. In combination with a tool. retainer for a reciprocativelyoperated tool, a machine head, a tool retainer adjustably supportedthereby, and a spring held latch carried by said head and adapted tolimit the' upward movement of said tool retainer.

4;. In combination with. a. tool retainer for areciprocatively operatedtool, a machine head, a'.v tool supported therein, a tool retainercarried by said head, said retainer com prising a link, the body ofwhich surrounds the saidtoohadjusting means for said link and stop meanscoordinated with said link and interposable. between said head and link.5. In a pneumatic drill, a head, a hook supported thereby, alink movablycarried .bygsaid hook, a tool supported by said head,

a collar onsaid tool, the walls of said link defining an opening greaterthan the circum ference ofthe'said collar and also an inter,-communicatingbpening congruent with the diameter'of the. tool, a latchpivotally sup-' ported by said head,'the body of saidlatch beingarranged to abut the head and intercept the upward movement of the,link.

6. Ina pneumatic drill, a head, a hook supported thereby, a linkmo'vably carried by said hook, a tool supported by said head, a collaron said tool, the walls. of said link defining an opening greater thanthe circumference of the said collar and also an intercommunicatingopening congruent with the diameter of the tool, a stop pivotallysupported by said head, and disposed relative to the end portion of thehead and the zone of movement of the said link to be interposabletherebetween. I

7. In a pneumatic drill, a head, a hook supported thereby, a linkmovably carried by said hook, a tool supported by said head, a

collar von said tool, the walls of said link devfining an openinggreater than the circumferenoe of the'said collar and also anintercommunicating opening congruent with the diameter of the tool, andmeans interposable between said link and said head delimiting the upwardmovement of the link.

In testimony whereof I hereunto afiix my signature this 15th day of June,1929.

' I DANIEL J. HAFFORD.

